Control for coolants in liquid cooled motors



that on starting 'the'motor Patented Mar. 14, 1950 UNITED STATES PATENT oFncE CONTROL FOR COOLANTS .INLIQUID .CO'O'LED MOTORS Lawrence J Sohler,.Portland;reg. Application October 20, 1948, SerialNc. 55,495

4 Claims.

This invention relates generally to systems using a fluid "for the transportation of'heat and the control of the heat transfer capacity of va heat transfer means in such a system. More particularly the invention may relate to 'the control of'the circulation of the coolant in the cooling system of a, liquid cooled motor of the internal combustion type.

The 'main object of this invention is to prevent congealing of the coolant during operation of the motor to the extent of preventing circulation.

The second object of this invention is to control the heat transfer capacity of the heat transfer means used'for cooling the motor coolant so its temperature will be brought up into an efficient motor operating range inas short a time as is feasible.

The third object of the invention is to assure complete circulationof engine cooling passages at all times so that changes of engine temperature will be as uniform as it is possible to attain and thus to prevent the large temperature stresses in'the engine parts which would occur if the engine temperature changed rapidly without circulation of the coolant.

The fourth object of this invention is'tomake available as soon as possible on starting the motor a portion of the heat transfer unit or engine radiator which will be warm enough to warm the passenger space of an automobile using an engine equipped in accordance with this invention.

How these and other objects are attained will be made clear by reference to the following description and the accompanying drawing, in which Fig. 1 is a fragmentary plan view of a typical automobile engine and its cooling accessories in accordance with this invention.

Fig. 2 is a side elevation of the equipment shown in Fig. 1.

Fig. 3 is a fragmentary section taken along the line 33 of Fig. 2.

Fig. 4 is a fragmentary section taken along the line 4-4 of Fig. 2.

Like numbers denote figures of the drawing.

Referring now to the drawing, there is shown a liquid cooled internal combustion engine having a main engine block II, a cylinder head l2, a heat transfer unit or radiator l3 for cooling the coolant, a. fan l4 for drawing cooling air through the horizontal passages I 5 in the core of radiator like parts in the several the coolant through the l3 and a coolant pump l6 .for drawing :;the coolant from lower end tank I! of radiator. l3 through hose 18 to pump inlet l9 and then forcing the coolant from pump outlet 20 through the cooling passages in the engine block I 'l 'andlhead l2, pipe 2|, upper tank 22 and down through vertical coolant pipes 23 to lower end tank I] of radiator l3.

Fan impeller l4 and the impeller of pump 16 are driven from the crankshaft (not shown) of the engine through V-b'elt 24 and sheave 25 secured to the shaft common-to the fan andpump impellers.

Upper end tank 22 of radiator l 3 is dividedinto two compartments 26 and 21 by a vertical transverse partition 23 having an opening '29 therein. Opening 29 is opened above a predetermined temperaturerange and closed below a predetermined temperature range of'the coolant 'bya disk 30carried on-stem 3| of heat responsive element "32 supported in bracket 33 carried on partition '28.

Bearing 34-securedto partition "28 guides stem 31 as it is moved axially due to the expansion or contraction of member '32 because of changes in the temperature of the coolant in compartment.

A coolant pressure responsive valve member shown generally as '35 is connected at end 36 to auxiliary inlet '31 of pump l6 and atits other end to pipe 21 through branch pipe connection .38.

Valve comprises a cylindrical body 39 having a transverse partition 40 with an opening therein finished to form a seat for valve 4| carried on stem 42, guided in perforated web 43 and perforated clip 44 pressed into body 39 to a position predetermined to compress spring 45 to prevent valve 4| from leaving its seat until the pressure of the coolant in pipe 2! attains a desired value.

From the above description, it is seen that if the engine is started when cold and the cooling system is filled with cold coolant, disk 30 will have closed opening 29 and coolant will be forced by pump It to flow through outlet 20, engine passages in parts H and I2, pipe 2|, upper tank compartment 26, radiator tubes 23, connecting compartment 26 with lower end tank I! and from tank I! through pipe l8 to pump inlet l9. During this time, should the fluidity of the coolant or its quantity flowing with respect to the carrying capacity of tubes 23 from compartment 25, be such that the pressure in pipe 2| rises to the setting value of valve 35, this valve will open to limit the pressure to this pre-set maximum value. It should be noted that whether or not valve 35 opens, the circulation of the coolant through the engine passages is continuous and complete.

' senger space in an automobile having an engine using the coolant circulating system of this invention, either air to the passenger space can be taken through the passages l5 around those tubes 23 of radiator core 13 which are connected to compartment 26 or a common radiator type heater can be pipe connected between pipes l8 and 2| of the system.

It can be seen that a cooling system is thereby automatically protected at low temperatures by insuring a limited circulation through a portion of the radiator at all operating times.

Having thus illustrated and described the elements and operation of a form of my invention, I claim:

1. A cooling system for a fluid cooled engine comprising in combination, an engine having cooling fluid passages therein, a radiator, a coolant pump, a fluid coolant, means for driving said pump, means connecting said engine, said radiator and said pump in series for circulating said coolant therethrough, and pressure controlled means for by-passing said radiator with a varying proportion of said coolant, said radiator comprising a core having fluid coolant passages therethrough, a single compartment end tank at one end of said core, a two compartment end tank at the other end of said core, an opening between the compartments of said two compartment tank and a thermostatically controlled means for controlling the fluid flow through said opening, said thermostatically controlled means being responsive to the coolant temperature in one of said two compartments.

2. A heat transfer unit comprising a first radiator and a second radiator, each of said radiators comprising a, first end tank, a second end tank,

and a core comprising multiple means for passing a first fluid from said first end tank to said second end tank and means for passing a second fluid in heat transfer relationship to said multiple means, said unit including means for passing said first fluid from the first end tank of said first radiator to the first end tank of said second radiator and means responsive to the temperature of said first fluid in said first end tank of said first radiator to control the flow of said first fluid from said first end tank of said first radiator to said first end tank of said second said coolant therethrough, said radiator comprising a core having coolant passages therethrough, a single compartment end tank and a two compartment end tank, and means for passing coolant from one compartment to the other compartment of said two compartment tank in an amount influenced by the temperature of said coolant in said one compartment of said two compartment tank.

4. A heat transfer unit comprising a core, a first end tank and a second end tank, said core comprising multiple means for passing a first fluid in parallel streams from said first end tank to said second end tank and means for passing a second fluid in heat transfer relation to said multiple means, said first end tank having a first communicating with a first part of said multiple means and a second compart- LAWRENCE J. SOI-ILER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Nicholas May 29, 1945 

